検索結果 9157 件
| JaLCDOI | 10.18926/15729 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_239.pdf |
| 著者 | Taniguchi Takeo| |
| 抄録 | In this paper the minimum fill-in problem which arises at the application of the sparse matrix method for linear sparse systems is discussed from the graphtheoretic viewpoint and the author gives some results which can be directly introduced in the design of, so called, the optimal elimination ordering algorithm which gives the minimum fill-in(the number of zeros in coefficient matrix which become non-zero during the elimination process). Through this investigation only graphs are treated instead of the coefficient matrices for linear systems, and the elimination process for a matrix is equivalated to the vertx eliminations for the graph. Then, the results by the theoretical investigation are summarized as following: 1. Optimal elimination for each subgraph which is subdivided appropriately from whole graph leads to the global optimum. 2. In each subgraph there are only two kind of eliminations. Furthermore, some numerical experiments show the characteristics of the subset of vertices, which subdivide a subgraph from the residual. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-03-05 |
| 巻 | 13巻 |
| 開始ページ | 239 |
| 終了ページ | 248 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307617 |
| JaLCDOI | 10.18926/15727 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_77.pdf |
| 著者 | Ohta, Mutsuo| Kobayashi, Toshinori| 榊原 精| |
| 抄録 | The clustering phenomenon was observed when dilute Al-Zn alloys were annealed at temperatures higher than the solvus of the G.P.zones. In this report the apparent activation energy for clustering is estimated and compared with the experimental results. The estimated value of the apparent activation energy for clustering in several Al-Zn alloys comes to 0.51 eV, which is larger than the effective migration energy 0.43 eV of Zn atoms in Al-Zn alloys. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1978-02-25 |
| 巻 | 12巻 |
| 開始ページ | 77 |
| 終了ページ | 88 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307178 |
| JaLCDOI | 10.18926/15725 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_12_59.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| 榊原 精| |
| 抄録 | Several Al-Zn alloys containing 0.041-4.4 at % Zn were studied by means of measurements of electrical resistivity. The results obtained are as follows : (1) The electrical resistivity increases when the specimen is annealed at temperatures higher than the solvus temperature of the G.P. zones. The increase of the resistivity is due to the formation of fluctuation. (2) The electrical resistivity of the specimen containing fluctuation is dependent upon annealing temperature only and independent of quenching temperature. (3) The fluctuation is formed in very dilute alloys as 0.041 at % Zn at temperatures higher than the solvus temperature of the G.P. zones. (4) The formation energy of vacancy and the migration energy of the Zn atom in the alloys determined by the formation process of fluctuation are in good agreement with those by the formation process of G.P. zones. (5) In spite of the result (4), it seems that the fluctuation is not the same as the small G.P. zones which are observed in the early stage of aging. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1978-02-25 |
| 巻 | 12巻 |
| 開始ページ | 59 |
| 終了ページ | 75 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307636 |
| JaLCDOI | 10.18926/15715 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_133.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| Yamada, Masuo| 榊原 精| |
| 抄録 | Aging and reversion in dilute Al-Ag alloys are studied by means of the measurements of electrical resistivity. Results obtained are as follows: 1) Increase in the as-quenched resistivity is found for a low quenching temperature. This increase may be due to the fluctuation of solute concentration at the quenching temperature. 2) When the fluctuation exists in the alloy, the aging rate becomes slow and the maximum resistivity in the isothermal aging curve becomes small as the vacancyconcentration becomes low. The maximum resistivity becomes large again when the vacancy concentration becomes further lower, and finally the maximum does not appear. 3) These behaviors are explained in terms of the difference in the rate of growth of the G.P. zones in the regions of higher and lower solute concentration induced by the fluctuation and in terms of the change of this difference with vacancy concentration. 4) G.P. zones may be formed by the spinodal decomposition with indefinite surfaces at first, grown to larger ones with difinite surfaces and changed to ordered nzones in the alloy. 5) It is confirmed that G.P. zones are formed by the nucleation-and-growth mechanism also in Al-Ag alloys above the spinodal temperature. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-03-05 |
| 巻 | 13巻 |
| 開始ページ | 133 |
| 終了ページ | 152 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307468 |
| JaLCDOI | 10.18926/15713 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_2_51.pdf |
| 著者 | Inouye Hiroshi| |
| 抄録 | In this paper some computational methods of traffic assignment are proposed. At first solutions of traffic assignment by the equal travel times principle used nonlinear programmings are showed. They are a method to approximate by a quadratic programming, a method to use the SUMT transformation, a method to apply Rosen's gradient projection method and a method to apply the conjugate gradient projection method. Through a computational example the efficiency of them are compared. To decide route flows uniquely in traffic assignment by the equal travel times principle, a method requesting route flows such that the joint probability is a maximum under supposed a priori probabilities is proposed. In case of a traffic assignment in a large scale road network, it is significant to improve the efficiency of route searches. For this purpose a technique of minimum time route search by division of a network is proposed. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1977-01-25 |
| 巻 | 11巻 |
| 号 | 2号 |
| 開始ページ | 51 |
| 終了ページ | 71 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307829 |
| JaLCDOI | 10.18926/15712 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_119.pdf |
| 著者 | Ohta, Mutsuo| Yamada, Masuo| Kanadani, Teruto| 榊原 精| |
| 抄録 | The effects of the fluctuation of solute concentration on the process of aging in Al-10wt % Zn alloy were studied by measurements of the intensity of small-angle X-ray scattering and by electron microscopy. Specimen was quenched from a higher temperature(T(Ql), mainly 300℃) to an intermediate temperature (T(Q2), 110~230℃), held there for a time, quenched again into iced water and aged isothermally at 0℃ or 40℃. Results obtained are as follows: (1) When the specimen was held at T(Q2) for a sufficient time and aged at relatively high temperatue(e.g. Ihr at 125℃ and aged at 40℃), a two-step increasing of both resistivity and integrated intensity was found. (2) Each of the steps has characteristics of the formation of G.P. zones by the spinodal decomposition. (3) When the maximum resistivity(p(max)) takes a minimum, Size distribution of the G.P. zones, estimated from the difference between Guinier and Porod radii, is much broader than that at p(max) in the usual direct quenching. (4) When the holding time at T(Q2) is long enough, the size distribution at p(max) is as broad as that at p(max) in the usual case. (5) After a prolonged aging under the condition that P(max) takes minimum, G.P. zones grow markedly and become oblate ellipsoidal with a major axis of about 20nm. (6) These results are consistently understood in terms of the fluctuation of solute concentration at T(Q2) and the change in the concentration of vacancies during annealing at T(Q2). That is, it is considered that these results are due to the difference in aging behavior between the regions of relatively high concentration and the ones of low concentration induced by the fluctuation. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-03-05 |
| 巻 | 13巻 |
| 開始ページ | 119 |
| 終了ページ | 132 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307931 |
| JaLCDOI | 10.18926/15709 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_13_95.pdf |
| 著者 | Ohta, Mutsuo| Kanadani, Teruto| Yamada, Masuo| 榊原 精| |
| 抄録 | Aging process in Al-Zn alloys was studied by the measurements of the electrical resistivity when the alloy was quenched from a high temperature, about 300℃ (the first quenching temperature), to an intermediate temperature, between 110℃ and 230℃ (the second quenching temperature), held at this temperature for a time, quenched again into iced water and aged at a low temperature. Variation of the holding time at the second quenching temperature brings about the variation of the isothermal aging curves. Maximum resistivity of the isothermal aging curve, p(max) , decreases at first, passes a minimum and then increases to reach a stationary value as the holding time at the intermediate temperature increases. It is pointed out that this phenomenon is mainly due to the fluctuation of solute concentration and the vacancy concentration decreasing at the intermediate temperature. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1979-03-05 |
| 巻 | 13巻 |
| 開始ページ | 95 |
| 終了ページ | 117 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307526 |
| JaLCDOI | 10.18926/15701 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_11_1_7.pdf |
| 著者 | Ishii Tadao| Doi Mitsuharu| |
| 抄録 | An investigation was made of the anomalous electric field in its various aspects in n-type InSb subjected to strong magnetic field at 77K and 273K, which lead to the conclusion that no open contradiction arose between a part of the present observations and the predictions attainable from Yoshida's model of semimetals. There remained, however, the other part of the experimental results unexplained, being rather natural since an inner property of indium antimonide does not seem so simple comparing with the compensated metals, bismuth and antimony. Especially as for the mechanism of an inversion phenomenon of the polarity of a negative anomalous field at a critical pulse current, we have no available theory to explain at present stage. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-07-20 |
| 巻 | 11巻 |
| 号 | 1号 |
| 開始ページ | 7 |
| 終了ページ | 18 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307614 |
| JaLCDOI | 10.18926/15697 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_61.pdf |
| 著者 | Misaki Takayoshi| Okamoto Takuji| Yamamoto Hideki| |
| 抄録 | An asynchronous delay line for PAM signal having controlled delay capability is proposed. The delay line in a cascaded chain of identical memory cells. Each sample of the sequence of the input PAM signals passes or is shifted in particular cell depending on whether the succeeding cell is empty or not. A cell is composed of two memory capacitors with the peripheral control circuits. In this paper, especially, an example of the circuit for cell is shown and its several characteristics are discussed. At the end, some experimental results are given. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 61 |
| 終了ページ | 66 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307866 |
| JaLCDOI | 10.18926/15692 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_63.pdf |
| 著者 | Fujiwara Yutaka| Osaki Hirokazu| Kikuchi Susumu| |
| 抄録 | We tried to look at the allocation techniques in plant layout from the point of view of decision making theory. And it was made clear that Laplace, Minimax and Hurwicz princilpe can be applied to the allocation techniques. The techniques based on these principles were called Laplace method, Minimax method and Hurwicz method. In this paper algorithms and computer programs of these methods were described in order to solve the layout problems effectively. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 63 |
| 終了ページ | 80 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307132 |
| JaLCDOI | 10.18926/15691 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_47.pdf |
| 著者 | Takahashi Katsuaki| Miura Yoshinari| |
| 抄録 | Diffusion phenomena of silver ion in the molten sodium diborate of low silver ion content were investigated at the temperature range from 880℃ to 625℃ by means of chronopotentiometry. From the results, it was shown that the silver ion was reduced reversibly to metallic state at the silver electrode used and silver ion was transported only by diffusion in case that transition time in a potential-time relation was within several seconds. Diffusion coefficients measured at various temperatures satisfied Arrhenius equation. The activation energy of diffusion and diffusion coefficient were respectively 32Kcal/mol and 6.5×10(-7) cm(2)/sec at the liquidous temperature. By comparing these values with those obtained in some molten salts, the difference of structure between the molten glass and molten salts was discussed. Moreover, the consideration for the size of borate anion existing in the molten glass was also tried from the viewpoint of rate process and from Stokes-Einstein's equation. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 47 |
| 終了ページ | 53 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307810 |
| JaLCDOI | 10.18926/15690 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_55.pdf |
| 著者 | Nakata Takayoshi| Ishihara Yoshiyuki| Matsubara Kazunori| Nakano Masanori| |
| 抄録 | A new method have been developed based upon analogue-to-digital conversion techniques and memories. The method involves the scaling of operating frequency from "real" to "optimum" for the power loss measurement. The advantages of using this techniques are as follows: (1) extreme availability at lower frequency region, (2) high accuracy and high stability, (3) simple measuring procedure, (4) digital indication. This method can be measured the power losses over the frequency range 0.1Hz to 1kHz for magnetic circuit and d.c. to 1kHz in such a purely resistive circuit. We estimate the accuracy of this core loss measuring system within 1.0% over all these frequency range. Using this system, specific core losses of the various grades of silicon iron have been measured in the frequency range 0.1Hz to 200Hz. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 55 |
| 終了ページ | 61 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307969 |
| JaLCDOI | 10.18926/15684 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_15.pdf |
| 著者 | Shimamoto Yuzuru| Tanaka Yutaka| |
| 抄録 | Results of calculations and experiments on the cold co-axial flow presented in this paper are summalized as follows ; (1) A theoretical expression method for co-axial flow field of two dimension is investigated to estimate more exactly the flow profile and the velocity gradient. (2) Measurements of mixing length were carried out for the confined co-axial jet flow. On the basis of measured data, inquiry is made for the propriety of the assumption proposed in the previous paper (1) that the mixing length may be expressed as a function of the minimum distance to the nearby wall. (3) Experimental inquiry was also done on the corelation between Lagrangian length scale and the mixing length. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 15 |
| 終了ページ | 24 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307794 |
| JaLCDOI | 10.18926/15681 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_1.pdf |
| 著者 | Honda Kazuo| Hosokawa Norio| Sarai Takaaki| |
| 抄録 | The diffracted intensity of X-ray depends upon several physical and geometrical factors such as structure, multiplicity, absorption and Lorentzpolarization and measuring conditions such as time constant and scanning speed of detector on counter method[l]. For analyzing on the X-ray stress measurement, especially, profile shape of X-ray diffraction which is affected by geometrical factors such as absorption and Lorentz-polarization is very important. In order to eliminate these factors affecting the stress measured by using X-ray, the correcting factors were introduced and those theoretical values were calculated. After this theoretical calculation, it is found that as the half value breadth increases the difference between the stress measured by using X-ray and the corrected one becomes larger and larger under same measuring condition. When the ideal diffracted intensity of X-ray is assumed Cauchy distribution the measured stress depends upon measuring condition for same specimen, but it is independent of measuring condition in Gauss, distribution. Consequently, it is found that the stress measured by using X-ray must be corrected under each measuring condition and the method of correction is made clear and proved experimentally in this paper. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 13 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307339 |
| JaLCDOI | 10.18926/15678 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_1_39.pdf |
| 著者 | Ohta Mutsuo| Hamamoto Takao| |
| 抄録 | As to Al-Zn alloy, the difference between the formation of G.P.zones and that of clusters was investigated by measurements of electrical resistivity. The results obtained were summarised as follows: (1) G.P.zones formed during the quench and quenched-in vacancies increase greatly as-quenched resistivity P(o) as quenching temperature Tq is raised, and clusters increase slightly P(o) as Tq is lowered. (2) For one Tq and one Ta, the time required to reach P(e)' for Al-1.3at % Zn alloy is longer than that for Al-3.0at % Zn alloy. This is due to the difference of number of zinc atom in the clusters. (3) For one Ta and one concentration of zinc, the time required to reach p'(e) at Tq = 170℃ is longer than that at Tq = 300℃. This is due to the difference in concentration of quenchedin vacancies. As to Al-Cu alloy, the solvus temperature for G.P.zones was determined from the existence of P(m) in ageing curves by measurements of electrical resistivity. Consequently the solvus temperature is between 20℃ and 60℃. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1975-07-01 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 39 |
| 終了ページ | 47 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307266 |
| JaLCDOI | 10.18926/15677 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_5_1.pdf |
| 著者 | Honda Kazuo| Konaga Tetsuro| |
| 抄録 | X-ray microbeam diffraction technique is a useful one to investigate the features of the crystal deformation in a localized area. That is, this method have been adopted to examine the density and array of dislocation, microscopic lattice strain and macroscopic residual stress. And so, the informations obtained from the tip of the crack during the fatigue process have been correlated with the behaviours of the initiation and propagation of the crack. The authors, in the present paper, investigated a relation between the distributions of the microscopic lattice strains which are calculated and measured by the technique, and suggested the sort of dislocation at the tip of the crack that relate to the fatigue crack propagation. The crack initiated at the notch root of the specimen which was composed of the coarse grain and propagated along the grain-boundary in the early stage under fatigue process of the alternating stress 4.1 kg/mm(2). Thereafter, it changed the propagating direction toward the inside of the grain. The distributions of the micro lattice strain in each reflecting plane which were measuerd at the plastically deformed zone in the vicinity of the grainboundary and at the crack tip agreed well with modes of the strain distribution due to a screw and a edge dislocations by the calculation, respectively. From these results, the authors concluded that the fatigue crack propagation would relate closely to the changing in the sort of the dislocation from the screw to the edge. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1970-09-01 |
| 巻 | 5巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 6 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307657 |
| JaLCDOI | 10.18926/15674 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_1_1.pdf |
| 著者 | Nakajima Toshikatsu| Nakagawa Heisaburo| |
| 抄録 | This paper describes the basic boundary conditions in angular grinding, which is widely applied as a high efficiency machining and where a complicated-shaped workpiece is ground at the same time. The angular grinding is first classified into three basic types, an external, a surface and an internal angular grinding, depending on the axis angle between the wheel and the work axes. The undeformed chip shape, which is characterized by the interference angle, the maximum chip thicknes and the chip length, is then analyzed in each type of angular grinding. The effects of grinding conditions such as the axis angle, the speed ratio, the radius ratio and the successive cutting edge spacing upon the geometry of undeformed chip are discussed to make clear the relations between the basic boundary conditions and the working conditions in angular grinding. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1975-07-01 |
| 巻 | 10巻 |
| 号 | 1号 |
| 開始ページ | 1 |
| 終了ページ | 16 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307122 |
| JaLCDOI | 10.18926/15672 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_4_51.pdf |
| 著者 | Takahashi Teruo| Akagi Yasuharu| |
| 抄録 | In this report, the average holding time of gas in foaming layer and the number of transfer units based on gas-phase of the Rotational-current tray were considered experimentally. The average holding time was determined by water-air system. On the other hand, the number of transfer units was determined by water-ammonia-air system that gas-phase resistance controlled. The average holding time increases with gas and liquid velocities, and does not change with the tray dimensions clearly. From the experimental results of the number of transfer units, it was found that the tray can be operated at high efficiency up to larger gas and liquid flow rates than that of sieve trays. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1969-09-01 |
| 巻 | 4巻 |
| 号 | 1号 |
| 開始ページ | 51 |
| 終了ページ | 56 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307449 |
| JaLCDOI | 10.18926/15666 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_9_2_47.pdf |
| 著者 | Torii Sigeru| Uneyama Kenji| Ishihara Masakazu| |
| 抄録 | This paper describes mass spectral data from synthetic intermediates of linaloyl oxide. The fragmentation of sulfur functional groups including compounds l-8 would provide fruitful evidences for structural assignment of acyclic and alicyclic monoterpenoid precursors. Since, 1,3-dithianyl group in l,2, and 3 can provide a base peak and the elimination of the sulfinyl group from 7 and 8 is considered to occur at the initial stage of the fragmentation. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1974-12-25 |
| 巻 | 9巻 |
| 号 | 2号 |
| 開始ページ | 47 |
| 終了ページ | 51 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307176 |
| JaLCDOI | 10.18926/15665 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_9_2_35.pdf |
| 著者 | Nishiwaki Kazuie| Shimamoto Yuzuru| |
| 抄録 | This paper covers the work done in an attempt to reduce exhaust noise level without the decay of brake mean effective pressure of a two-cylinder two-stroke cycle engine, by means of an exhaust manifold having a throttle plate in its junction. The data are shown for various dimensions and configurations of the manifold and the discussion is given on the effect of exhaust throttling on exhaust noise level and engine performance. The principal results obtained by this study are as follows: (1) The lower limit of the throttle area was about onethird of a cross-sectional area of the manifold from the view point of brake mean effective pressure. (2) Within this limit brake mean effective pressure was scarcely influenced by throttling under the condition where a number of pressure oscillation related to the pulsation effect during an interval between discharges was less than 1.7. (3) A reduction in exhaust noise level attained was 8 dB(A) at higher engine speeds. (4) The junction angle of the manifold gave little significance to exhaust noise level and brake mean effective pressure. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1974-12-25 |
| 巻 | 9巻 |
| 号 | 2号 |
| 開始ページ | 35 |
| 終了ページ | 45 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307277 |